Add votes-final flag, warn on missing votes, and sync phases with results toggle

Endpoints/VoteEndpoints.cs

@@ -62,5 +62,18 @@ public static class VoteEndpoints
             await db.SaveChangesAsync();
             return Results.Ok(new { vote.Id, vote.Score });
         });
+
+        app.MapPost("/api/votes/finalize", async ([FromBody] VoteFinalizeRequest request, HttpContext ctx, AppDbContext db) =>
+        {
+            var player = await EndpointHelpers.GetAuthenticatedPlayer(ctx, db);
+            if (player is null) return Results.Unauthorized();
+            var phase = await EndpointHelpers.GetPhase(db, player.Id);
+            if (phase != Phase.Vote)
+                return EndpointHelpers.PhaseMismatch(Phase.Vote, phase);
+
+            player.VotesFinal = request.Final;
+            await db.SaveChangesAsync();
+            return Results.Ok(new { player.VotesFinal });
+        });
     }
 }